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尝试在asp.net中创建多对多关系时出错

[英]Error when trying to create many to many relationship in asp.net

 原文  2015-11-22 14:05:58  9   2    c#/ asp.net-mvc/ entity-framework

问题描述

我在尝试创建多对多关系模型时遇到Asp.Net问题，尝试注册帐户时出现此错误：

序列不包含匹配元素

当我“禁用”我的更改时，我可以正常在该站点上注册，因此我的模型中存在一些与我假设的列结构有关的错误，但我自己无法修复。 我想在我的Bookmark和Tag表之间创建多对多连接，并且多对多表应具有以下结构： Id ， BookmarkID ， TagID 。

这是我的模型： 

public class Bookmark
{   
    [Key]
    public int BookmarkID { get; set; }

    public string Url { get; set; }

    public ApplicationUser UserId { get; set; }

    public virtual ICollection<BookmarkTag> BookmarkTags { get; set; }
}

public class Tag
{
    [Key]
    public int TagID { get; set; }

    [Column(TypeName="varchar(60)")]
    public string TagName { get; set; }

    public virtual ICollection<BookmarkTag> BookmarkTags { get; set; }
}

public class BookmarkTag
{
    [Key, Column(Order = 0)]
    public int BookmarkTagID { get; set; }

    [Key, Column(Order = 1)]
    public int BookmarkID { get; set; }

    [Key, Column(Order = 2)]
    public int TagID { get; set; }

    public virtual Bookmark Bookmark { get; set; }
    public virtual Tag Tag { get;  set;}
}

这也是错误堆栈跟踪：

[InvalidOperationException：序列不包含匹配的元素]
System.Linq.Enumerable.Single（IEnumerable 1 source, Func 2谓词）+2603017 System.Data.Entity.Utilities.DbProviderManifestExtensions.GetStoreTypeFromName（DbProviderManifest providerManifest，字符串名称）+81
System.Data.Entity.ModelConfiguration.Configuration.Properties.Primitive.PrimitivePropertyConfiguration.ConfigureColumn（EdmProperty列，EntityType表，DbProviderManifest providerManifest）+87
System.Data.Entity.ModelConfiguration.Configuration.Properties.Primitive.PrimitivePropertyConfiguration.Configure（EdmProperty列，EntityType表，DbProviderManifest providerManifest，布尔值allowOverride，布尔值fillFromExistingConfiguration）+138
System.Data.Entity.ModelConfiguration.Configuration.Properties.Primitive。<> c__DisplayClass4.b__3（Tuple 2 pm) +38
System.Data.Entity.Utilities.IEnumerableExtensions.Each(IEnumerable 2 pm) +38
System.Data.Entity.Utilities.IEnumerableExtensions.Each(IEnumerable 2 pm) +38
System.Data.Entity.Utilities.IEnumerableExtensions.Each(IEnumerable 1 ts，动作1 action) +130
System.Data.Entity.ModelConfiguration.Configuration.Properties.Primitive.PrimitivePropertyConfiguration.Configure(IEnumerable 1 action) +130
System.Data.Entity.ModelConfiguration.Configuration.Properties.Primitive.PrimitivePropertyConfiguration.Configure(IEnumerable 1 action) +130
System.Data.Entity.ModelConfiguration.Configuration.Properties.Primitive.PrimitivePropertyConfiguration.Configure(IEnumerable 1 propertyMappings，DbProviderManifest providerManifest，Boolean allowOverride，Boolean fillFromExistingConfiguration）+94
System.Data.Entity.ModelConfiguration.Configuration.Types.StructuralTypeConfiguration.ConfigurePropertyMappings（IList 1 propertyMappings, DbProviderManifest providerManifest, Boolean allowOverride) +154
System.Data.Entity.ModelConfiguration.Configuration.Types.EntityTypeConfiguration.ConfigurePropertyMappings(DbDatabaseMapping databaseMapping, EntityType entityType, DbProviderManifest providerManifest, Boolean allowOverride) +585
System.Data.Entity.ModelConfiguration.Configuration.Types.EntityTypeConfiguration.Configure(EntityType entityType, DbDatabaseMapping databaseMapping, DbProviderManifest providerManifest) +177
System.Data.Entity.ModelConfiguration.Configuration.ModelConfiguration.ConfigureEntityTypes(DbDatabaseMapping databaseMapping, ICollection 1 propertyMappings, DbProviderManifest providerManifest, Boolean allowOverride) +154
System.Data.Entity.ModelConfiguration.Configuration.Types.EntityTypeConfiguration.ConfigurePropertyMappings(DbDatabaseMapping databaseMapping, EntityType entityType, DbProviderManifest providerManifest, Boolean allowOverride) +585
System.Data.Entity.ModelConfiguration.Configuration.Types.EntityTypeConfiguration.Configure(EntityType entityType, DbDatabaseMapping databaseMapping, DbProviderManifest providerManifest) +177
System.Data.Entity.ModelConfiguration.Configuration.ModelConfiguration.ConfigureEntityTypes(DbDatabaseMapping databaseMapping, ICollection 1 propertyMappings, DbProviderManifest providerManifest, Boolean allowOverride) +154
System.Data.Entity.ModelConfiguration.Configuration.Types.EntityTypeConfiguration.ConfigurePropertyMappings(DbDatabaseMapping databaseMapping, EntityType entityType, DbProviderManifest providerManifest, Boolean allowOverride) +585
System.Data.Entity.ModelConfiguration.Configuration.Types.EntityTypeConfiguration.Configure(EntityType entityType, DbDatabaseMapping databaseMapping, DbProviderManifest providerManifest) +177
System.Data.Entity.ModelConfiguration.Configuration.ModelConfiguration.ConfigureEntityTypes(DbDatabaseMapping databaseMapping, ICollection 1实体集，DbProviderManifest providerManifest）+423
System.Data.Entity.ModelConfiguration.Configuration.ModelConfiguration.Configure（DbDatabaseMapping databaseMapping，DbProviderManifest providerManifest）+376
System.Data.Entity.DbModelBuilder.Build（DbProviderManifest providerManifest，DbProviderInfo providerInfo）+444
System.Data.Entity.DbModelBuilder.Build（DbConnection providerConnection）+55
System.Data.Entity.Internal.LazyInternalContext.CreateModel（LazyInternalContext internalContext）+61
System.Data.Entity.Internal.RetryLazy 2.GetValue(TInput input) +123
System.Data.Entity.Internal.LazyInternalContext.InitializeContext() +616 System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType) +18
System.Data.Entity.Internal.Linq.InternalSet 2.GetValue(TInput input) +123
System.Data.Entity.Internal.LazyInternalContext.InitializeContext() +616 System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType) +18
System.Data.Entity.Internal.Linq.InternalSet 2.GetValue(TInput input) +123
System.Data.Entity.Internal.LazyInternalContext.InitializeContext() +616 System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType) +18
System.Data.Entity.Internal.Linq.InternalSet 1.Initialize（）+53
System.Data.Entity.Internal.Linq.InternalSet 1.get_InternalContext() +16 System.Data.Entity.Infrastructure.DbQuery 1.System.Linq.IQueryable.get_Provider 1.get_InternalContext() +16 System.Data.Entity.Infrastructure.DbQuery 39 System.Data.Entity.QueryableExtensions.FirstOrDefaultAsync（ IQueryable 1 source, Expression 1谓词，CancellationToken cancelToken）+154 System.Data.Entity.QueryableExtensions.FirstOrDefaultAsync（IQueryable 1 source, Expression 1谓词）+163
Microsoft.AspNet.Identity.EntityFramework.d__6c.MoveNext（）+472 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务）+99
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）+58 Microsoft.AspNet.Identity.CultureAwaiter 1.GetResult() +59 Microsoft.AspNet.Identity.<ValidateUserName>d__4.MoveNext() +594 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +99
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58 Microsoft.AspNet.Identity.<ValidateAsync>d__0.MoveNext() +266 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +99
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58 Microsoft.AspNet.Identity.<CreateAsync>d__0.MoveNext() +568 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +99
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58 Microsoft.AspNet.Identity.<CreateAsync>d__d.MoveNext() +483 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +99
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58 System.Runtime.CompilerServices.TaskAwaiter 1.GetResult() +59 Microsoft.AspNet.Identity.<ValidateUserName>d__4.MoveNext() +594 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +99
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58 Microsoft.AspNet.Identity.<ValidateAsync>d__0.MoveNext() +266 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +99
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58 Microsoft.AspNet.Identity.<CreateAsync>d__0.MoveNext() +568 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +99
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58 Microsoft.AspNet.Identity.<CreateAsync>d__d.MoveNext() +483 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +99
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58 System.Runtime.CompilerServices.TaskAwaiter 1.GetResult() +59 Microsoft.AspNet.Identity.<ValidateUserName>d__4.MoveNext() +594 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +99
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58 Microsoft.AspNet.Identity.<ValidateAsync>d__0.MoveNext() +266 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +99
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58 Microsoft.AspNet.Identity.<CreateAsync>d__0.MoveNext() +568 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +99
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58 Microsoft.AspNet.Identity.<CreateAsync>d__d.MoveNext() +483 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +99
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58 System.Runtime.CompilerServices.TaskAwaiter 1.GetResult（）+28 BookIT.Controllers.d__15.MoveNext（）在D：\\ Projekti \\ CS \\ BookIT \\ BookIT \\ Controllers \\ AccountController.cs：155
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务）+99
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）+58
System.Web.Mvc.Async.TaskAsyncActionDescriptor.EndExecute（IAsyncResult asyncResult）+97
System.Web.Mvc.Async。<> c__DisplayClass37.b__36（IAsyncResult asyncResult）+17
System.Web.Mvc.Async.WrappedAsyncResult 1.CallEndDelegate(IAsyncResult asyncResult) +10
System.Web.Mvc.Async.WrappedAsyncResultBase 1.CallEndDelegate(IAsyncResult asyncResult) +10
System.Web.Mvc.Async.WrappedAsyncResultBase 1.CallEndDelegate(IAsyncResult asyncResult) +10
System.Web.Mvc.Async.WrappedAsyncResultBase 1.End（）+49
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod（IAsyncResult asyncResult）+32
System.Web.Mvc.Async.AsyncInvocationWithFilters.b__3d（）+50 System.Web.Mvc.Async。<> c__DisplayClass46.b__3f（）+225 System.Web.Mvc.Async。<> c__DisplayClass33.b__32（IAsyncResult asyncResult）+ 10
System.Web.Mvc.Async.WrappedAsyncResult 1.CallEndDelegate(IAsyncResult asyncResult) +10
System.Web.Mvc.Async.WrappedAsyncResultBase 1.CallEndDelegate(IAsyncResult asyncResult) +10
System.Web.Mvc.Async.WrappedAsyncResultBase 1.CallEndDelegate(IAsyncResult asyncResult) +10
System.Web.Mvc.Async.WrappedAsyncResultBase 1.End（）+49
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters（IAsyncResult asyncResult）+34
System.Web.Mvc.Async。<> c__DisplayClass2b.b__1c（）+26 System.Web.Mvc.Async。<> c__DisplayClass21.b__1e（IAsyncResult asyncResult）+100
System.Web.Mvc.Async.WrappedAsyncResult 1.CallEndDelegate(IAsyncResult asyncResult) +10
System.Web.Mvc.Async.WrappedAsyncResultBase 1.CallEndDelegate(IAsyncResult asyncResult) +10
System.Web.Mvc.Async.WrappedAsyncResultBase 1.CallEndDelegate(IAsyncResult asyncResult) +10
System.Web.Mvc.Async.WrappedAsyncResultBase 1.End（）+49
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction（IAsyncResult asyncResult）+27
System.Web.Mvc.Controller.b__1d（IAsyncResult asyncResult，ExecuteCoreState innerState）+13
System.Web.Mvc.Async.WrappedAsyncVoid 1.CallEndDelegate(IAsyncResult asyncResult) +29
System.Web.Mvc.Async.WrappedAsyncResultBase 1.CallEndDelegate(IAsyncResult asyncResult) +29
System.Web.Mvc.Async.WrappedAsyncResultBase 1.CallEndDelegate(IAsyncResult asyncResult) +29
System.Web.Mvc.Async.WrappedAsyncResultBase 1.End（）+49
System.Web.Mvc.Controller.EndExecuteCore（IAsyncResult asyncResult）+36 System.Web.Mvc.Controller.b__15（IAsyncResult asyncResult，Controller控制器）+12
System.Web.Mvc.Async.WrappedAsyncVoid 1.CallEndDelegate(IAsyncResult asyncResult) +22
System.Web.Mvc.Async.WrappedAsyncResultBase 1.CallEndDelegate(IAsyncResult asyncResult) +22
System.Web.Mvc.Async.WrappedAsyncResultBase 1.CallEndDelegate(IAsyncResult asyncResult) +22
System.Web.Mvc.Async.WrappedAsyncResultBase 1.End（）+49
System.Web.Mvc.Controller.EndExecute（IAsyncResult asyncResult）+26
System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute（IAsyncResult asyncResult）+10
System.Web.Mvc.MvcHandler.b__5（IAsyncResult asyncResult，ProcessRequestState innerState）+21
System.Web.Mvc.Async.WrappedAsyncVoid 1.CallEndDelegate(IAsyncResult asyncResult) +29
System.Web.Mvc.Async.WrappedAsyncResultBase 1.CallEndDelegate(IAsyncResult asyncResult) +29
System.Web.Mvc.Async.WrappedAsyncResultBase 1.CallEndDelegate(IAsyncResult asyncResult) +29
System.Web.Mvc.Async.WrappedAsyncResultBase 1.End（）+49
System.Web.Mvc.MvcHandler.EndProcessRequest（IAsyncResult asyncResult）+28 System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest（IAsyncResult结果）+9
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute（）+9711525 System.Web.HttpApplication.ExecuteStep（IExecutionStep步骤，布尔值且已完成）+155

提前致谢

添加： 

  if (ModelState.IsValid)
        {
            var user = new ApplicationUser { UserName = model.Email, Email = model.Email };
            var result = await UserManager.CreateAsync(user, model.Password);
            if (result.Succeeded)
            {

2 个解决方案

解决方案1
 0  2015-11-22 21:40:23

您的Key属性过多，EF框架无法计算出您的模型。 您可以使用流利的api来精确配置所需的内容。 解决问题的最简单方法是使用EF功能“约定优于配置”。 基本上，遵循约定，EF框架将为您完成繁重的工作。 我在这里添加了关于配置方法的约定，并且至少在我的Visual Studio中运行。 我已经对此进行了测试，并且可以成功运行。 

public class Bookmark
{
   public int BookmarkID { get; set; }
   public string Url { get; set; }
   public ApplicationUser UserId { get; set; }
   public virtual ICollection<BookmarkTag> BookmarkTags { get; set; }
 }

 public class BookmarkTag
 {
    public int BookmarkTagID { get; set; }
    public virtual Bookmark Bookmark { get; set; }
    public virtual Tag Tag { get; set; }
 }

 public class Tag
 {
    public int TagID { get; set; }
    public string TagName { get; set; }
    public virtual ICollection<BookmarkTag> BookmarkTags { get; set; }
 }

解决方案2
 0  2015-11-29 11:55:32

最后，我找到了导致错误的原因...它就是这一行 

 [Column(TypeName="varchar(60)")]
public string TagName { get; set; }

当我删除Column（TypeName）部分时，代码可以毫无问题地进行编译...现在可以正常工作，但是我不确定为什么这样做或为什么抛出该错误。 谁能解释为什么以前不起作用？

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